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Colorimetric detection method for nitrate in explosive

A detection method and technology for explosives, applied in the field of colorimetric detection of nitrate, can solve the problems of high cost and poor portability, and achieve the effects of low cost, sensitive response and convenient use

Inactive Publication Date: 2020-02-04
XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires the use of cadmium columns, which is costly and poor in portability

Method used

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  • Colorimetric detection method for nitrate in explosive
  • Colorimetric detection method for nitrate in explosive

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Preparation of test reagents:

[0020] a. At room temperature, use an analytical balance to weigh out 0.015 p-aminobenzene sulfonamide, 0.005 g of N-1-naphthalene ethylenediamine hydrochloride, and 0.01 hydrazine sulfate into the flask, add 20 mL of water and stir until complete Dissolve, add 20μL of phosphoric acid, continue to stir for 10 minutes, airtight the flask, and obtain the detection reagent after 20 minutes of nitrogen flow, and package the detection reagent in the reagent bottle;

[0021] Prepare test paper;

[0022] b. Apply 0.1g zinc powder 2 evenly on the filter paper 1, then drop the pressure sensitive adhesive 3, dry, and cut to obtain the test paper 4, and then put the test paper 4 into the test bag;

[0023] c. Use a cotton swab to extract the test sample from sodium nitrate (chemical reagent), wipe the sodium nitrate test sample onto the test paper 4, and drop the test reagent obtained in step a onto the test paper 4 containing the sodium nitrate test sample...

Embodiment 2

[0025] Preparation of test reagents:

[0026] a. At room temperature, use an analytical balance to weigh out 0.015 p-aminobenzene sulfonamide, 0.01 g N-1-naphthalene ethylene diamine hydrochloride, and 0.01 g hydrazine sulfate into the flask, add 20 mL of water and stir until Dissolve completely, then add 20μL phosphoric acid, continue to stir for 10 minutes, seal the flask, and obtain the detection reagent after 20 minutes of nitrogen gas. The detection reagent is packaged in the reagent bottle;

[0027] Prepare test paper;

[0028] b. Apply 0.1g zinc powder 2 evenly on the filter paper 1, then drop the pressure sensitive adhesive 3, dry, and cut to obtain the test paper 4, and then put the test paper 4 into the test bag;

[0029] c. Use a cotton swab to extract a test sample from potassium nitrate (chemical reagent), wipe the potassium nitrate test sample onto the test paper 4, and drop the test reagent obtained in step a onto the test paper 4 containing the potassium nitrate test s...

Embodiment 3

[0031] Preparation of test reagents:

[0032] a. At room temperature, use an analytical balance to weigh out 0.018 g of p-aminobenzene sulfonamide, 0.0058 g of N-1-naphthalene ethylenediamine hydrochloride, and 0.01 g of hydrazine sulfate into the flask, and add 20 mL of water to fully stir. When it is completely dissolved, add 20μL of phosphoric acid, continue to stir for 10 minutes, airtight the flask, and obtain the detection reagent after 20 minutes of nitrogen gas, and package the detection reagent in the reagent bottle;

[0033] Prepare test paper;

[0034] b. Apply 0.1g zinc powder 2 evenly on the filter paper 1, then drop the pressure sensitive adhesive 3, dry, and cut to obtain the test paper 4, and then put the test paper 4 into the test bag;

[0035] c. Use a cotton swab to extract a test sample from ammonium nitrate (chemical reagent), wipe the ammonium nitrate test sample onto the test paper 4, and drop the test reagent obtained in step a onto the test paper 4 containing ...

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Abstract

The invention provides a colorimetric detection method for nitrate in an explosive. According to the detection method, a detection reagent is prepared from N-1-naphthalene ethylenediamine hydrochloride, p-aminobenzenesulfonamide, hydrazine sulfate, water and phosphoric acid; and test paper is prepared by uniformly smearing filter paper with zinc powder, then dropwise adding a pressure-sensitive adhesive, collecting a sample by using a cotton swab, putting the sample on the test paper, dropwise adding the detection reagent to the test paper containing the sample, and determining the existence of nitrate by observing whether a rose red compound is generated or not. The detection method provided by the invention can be used for qualitative detection of nitrate in self-made explosives and explosive residues of the explosive in field explosion searching and explosion cases, and the detection limit can reach 100 mug. According to the method, a suspicious sample does not need to be dissolved,and the method has the characteristics of simplicity and rapidness in operation, strong specificity, sensitivity in reaction, convenience in use and low cost, and can provide an effective technical means for detection of explosion cases of criminal investigation departments of public security systems.

Description

Technical field [0001] The invention relates to a colorimetric detection method for nitrate in explosives, in particular to a self-made explosive and a colorimetric detection method for nitrate in explosion residues. Background technique [0002] In recent years, the number of terrorist bombing incidents around the world has gradually increased, and there is an urgent need for rapid and convenient detection and analysis technology for explosives. Currently, commercially available portable explosive detection methods include ion mobility spectroscopy, metal detectors, portable Raman technology, fluorescence methods, etc. Among them, only ion mobility spectroscopy and portable Raman technology can identify explosive components, but ion mobility spectra exist The shortcomings of time-consuming calibration and high cost; portable Raman technology generally requires a large sample volume, and the instrument is expensive. [0003] At present, there are two main methods for detecting nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78G01N31/22
CPCG01N21/78G01N31/227
Inventor 窦新存张天实
Owner XINJIANG TECHN INST OF PHYSICS & CHEM CHINESE ACAD OF SCI
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